Engineering design of JSNS shutter system

Oikawa, Kenichi   ; Takada, Hiroshi   ; Maekawa, Fujio  ; Harada, Masahide   ; Futakawa, Masatoshi  ; Ikeda, Yujiro

Neutron beam shutter system of JSNS at J-PARC has been designed under a particular precondition that every shutter should be controlled and maintained independently. This is very important from viewpoints of usability and interlock system of JSNS. The biggest challenge we faced was that to meet a single shutter design on asymmetric and narrow angular intervals of JSNS beam-lines; 6.7 in minimum and 12.7 in maximum. To realize this precondition, a compact ball screw jack system sustaining a shutter gate with two shafts was designed. Rotating motion during open/close stroke is absorbed by a couple of oilless bearings (OILES corp.) fitted in every shaft guide. The assembly is driven by an electric servomotor.